Steam-actuated valve for engines.



No. 733,985. PATBNTED JULY 2;, 1903.

' s. LUNDQUIST.

STEAM AGTUATBD VALVE PoR ENGINES;

APPLIoATIoN r1LnD'APn.8. 1903. 1 No MODEL.

z sums-SHEET 1.

No. 733,985. PATNTED JULY 21, 1903.` S. LUNDQUIST.

STEAM AGTUATED VALVE FOR ENGINES. APPLIUATION FILED un. s. 1903-..

N0 MODEL. 2 SHEETS-SHBT Z.

@witnesses i UNITEDSTATES Patented .ul'y 21', 1903.

.PATENT OFFICE.

SAMUEL LUNDQUIST, OF DUBOIS, PENNSYLVANIA, ASSIGNOR OF ONE-HALF TO WILLIAM OSBORN, OF DUBOIS, PENNSYLVANIA.

sTl-:AM l-A'cT-uAfr-ED VALVE Ee R vENelN Es".

SPECIFICATION forming part of Letters ratent No, 733,985, dated Jury 21,1903.

. Application filed April e, 1903.

To LZZ whom t may concern:

is a specification.

The primary purpose of this invention is o to simplifyy the construction of direct-acting steam-engines and to reduce the number of working parts and wholly dispense with cams, tappets, and analogous mechanisms for operating the valve for controlling the admission of live steam to the engine and the exhaust of the spent steam therefrom. y

In accordance with this invention the piston of the engine and the slide-valve are so related in conjunction with steam ports and o ducts that the action of one is governed by the movement of the other when the throttle is open and the engine running.

For a full description of the invention and the merit-s thereof and alsoto acquire a knowl- 5 edge of the details of construction of the means for effecting the result reference is to be had tothe following description and drawings hereto attached.

While the essential and characteristic feao tures of the invention are susceptible of modi# to in the following description and indicated in all the views of the drawingsv by the same 5 reference characters.

The engine may be vof any pattern or make so long as it is of the direct-acting type. The cylinder 1 is provided with ports 2 j and 3, which are in communication at their outer J ends with the terminal portions of the cylinder and at theirinner ends with steam-chest.

ply, for the motive medium.

. more fully hereinafter.

sentimenten. ontladen p y The exhaust-port is indicated at'4l and commu- Be it known that 1,v SAMUEL LUNDQUIsr, a citizen of the United States, residing atDu# bois, in the county of Clearfield and State 'off 5 Pennsylvania, haveinventedcertain new and` useful Improvements in Steam Actuated' Valves for Engines, of which the followingA .nicates at its inner endwith the steam-chest and is adapted to be connected at its outer end with the pipe (notJ shown) for conveying Vthe, exhaust-steam to a suitable "point of dis- -c'harge The portsl 2, 3, and- Ltare of naryfconstruction andv arrangement and operate in the well-known Vmanner, with the slide-valve 5 for con trollingthe steam or like motive medium in its vsupply to and escape fromthe cylinder. The steam-'chest 6 is lccated at one side of the engine-cylinder and Ifis provided with they live-steamport 7 for connection with the boiler or other source of sup- Within the steam-chest are located slide-valve 5 and piston-valve 8, the two being connected for synchronous action, valvebeing provided with stemW 9, snugly fitted into an opening of piston-valve 8. The central portion of the piston-valveis reduced, the terminal portions -forming heads 10, which are tted snugly into reduced end portions 11 of the steamcheSt, said reduced portions ll constituting, in eliect, barrels for the piston-head 10 to op .crate in. The lower portion of the steamchcst or other part'adjacent to cylinder 1 is thickened to form seats 12, and between these seats operates slide-valve 5. Ducts or passages 13 and 14 and 13a and 14a connect the respective barrels l1 with the exhaustport 4 and the center portion of cylinder 1 vfor a purpose presently to be explained. The ducts 13 and 13a establish communication between the respective barrels 11 and exhaustport 4, and the ducts 14 aord communication between said barrels and cylinder 1 and cross near their inner ends, whereby duct 14 is in communication with the left-hand end portion of cylinder l and duct 14a is in communicationwith the right-hand end of cylinder 1, this being essential, as will appear An opening or duct 415 connects the central portion of cylinder 1 with exhaust-port 4.

The piston 16 is somewhat longer than cnehalf the length of cylinder 1, and in order that it may be of a minimum weight consistent with strength its central portion is reduced, as shown at 17, the end portions constituting heads 18, which have a steam-tight Ioo vas

iit in the cylinder, so as to preclude waste of steam. The piston may be of any substantial construction, and the parts 17 and 18 may be of integral formation or separately formed and fitted together' and to the piston-rod.

To admit of operation of the piston-valve by hand, a stem 19 is connected thereto and passes through stuing-box 2O at one end of steam-chest G. The parts being assembled substantially as herein disclosed and the throttle being opened and piston 1G having been driven to the right-hand end of the cylinder, as indicated in Fig. l, and the pistonvalve being at the left-hand end of the steamchest, tho steam from the steam-chest enters the right-hand end of cylinder 1 through port 3 and drives the piston to the left, and as it approaches the limit of its movement to the left port 14a is uncovered and live steam passing therein enters the left-hand end of the steam chest and forces piston valve to the right, carrying slide-Valve 5 and closing port 3 and opening port 2, thereby permitting the live steam to enter port 2 and drive the piston to the right until port 14 is uncovered, when the live steam will enter the right-hand end of the steam-chestand drive piston-valve S to the left. The steam finding its wayinto the barrels 11 will pass to the exhaust-port 4 through ducts 13 and 13, as will be readily understood.

The opening 2l at the top of the chest 6 is for connection therewith of an oil-cup (not shown) for lubricating the valves.

Having thus described the invention, what is claimed as new is 1. In a direct-acting engine, the combination of the cylinder and chest provided with admission and exhaust ports and with pairs of ducts 13, 14 and 13a, 14, the outer ends of the ducts communicating with the respective end portions of the chest at different points in its length, the inner ends of ducts 13 and 13 connecting direct with the said exhaustport, and the inner ends of ports 14 and 14 connecting with the middle portion of the cylinder upon opposite sides of a medial line, a piston arranged to reciprocate in the cylinder, a piston-valve mounted to reciprocate in said chest and control the said pairs of ducts, and a slide-valve for controlling the exhaust and admission ports and connected with the piston valve for synchronous movement therewith, the piston and piston-valve being arranged with reference to the said ducts and ports to operate in the manner substantially asset forth.

2. In combination, an engine-cylinder provided with exhaust and live ports and having its central portionin communication with the exhaust-port by means of. an opening or duct, a piston arranged to work within said cylinder and of a length exceeding one-half the length of said cylinder and havingits intermediate portion reduced, a chest having its terminal portions red uccd to form barrels, ducts connecting said barrels with the exhaust-port, other ducts connecting said barrels with the central portion of the cylinder upon opposite sides of a medial line and crossing near their inner ends, a slide-valve for controlling the exhaust and live ports and arranged to work in the chest between the reduced end portions thereof, and a piston-valve having its end portions snugly litted in said barrels and having its intermediate portion connected with said slide-valve for synchronous movement therewith, substantially as specified.

In testimony whereof I ax my signature in presence of two witnesses.

SAMUEL LUN DQUIST.

Witnesses:-

JET KEARNs, W. C. PERRY. 

